1.This book will show you ------- from books is put into pra

1 B。how what you've learned2 C。how what两题基本句型都一样,是 。。。how (something) be done。This book will show you how (what you've learned from books) is put into practical use。Mr。Green will show you how (what you have observed) can be used in other context。what 引导的名词短句是后面从句的主语!参考：This book will show you how piano is made。